Ple-Sen
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I would consider it from the perspective of the plot, rather than specializations. And from the perspective of the plot, there is potential in the second game (the war for the legacy), the third game (the intrigues of the Necromancers), and the fourth game. If we are talking about role-playing games within the setting, then the Castor conspiracy, with the inhabitants of Dey and Archibald in the form of the city, would be a good fit.